Anti-Virus and Trojan initiated a system named Guard Ghost to supervise all running processes in the memory system, Windows files, and open ports to search worms and Trojan horses. Once a virus or Trojan appears, even if it is hidden in other programs, Anti-Virus and Trojan will display a warning signal and eliminate it consequently. Meanwhile, Anti-Virus and Trojan will clear all virus-system-linked files as well as relative registered files.